Adjustable core-box



E. w. CLARK. ADJUSTABLE CORE BOX.

APIPLICATION FILED OCT.31,19I8.

E. W. CLARK.

ADJUSTABLE CORE BOX. APPLICATION FILED 06T. 31. 191s.

Patented July 20, 1920.

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E. W. CLARK.

ADJUSTABLE CORE'BOX.

APPLICATION FILED OCT. 3l, 1918.

du M UNITED STATES PATENT OFFICE.

EDWARD W. CLARK, OF LOS ANGELES, CALIFORNIA, ASSIGNQB OF ONE-HALF TO STANLEY S. TURNER, OF PASADENA, CALIFORNIA.

ADJUSTABLE CORE-BOX.

VT0 all whom t may concern:

Be it known that I, EDWARD WV. CLARK, a citizen of the United States, residing in the city of Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Adjustable Core-Boxes, of which the follow-v ing is a specification.

My Vinvention relates to core boxes, or means for molding the interiors of hollow articles, and is particularly adapted for use in molding pistons .for internal combustion engines, in which pistons of a minimum weight are preferable for use, the primary object of this invention being to provide means for forming the cores so as to vary the character and dimensions of the pistons other than the diameter according to necessity, whereby the core mold may be stripped from the core without damage to said core.

While there are relativelyV few standard diameters of pistons for internal combustion engines, there are a great many variations of design for pistons of each standard diameter. Such variations include different dimensions from the pin *centers to the head, the lengths of Vthe piston skirt, that is the Vdistance from the pinvcenters to the lower end'oi the pistons, the diameter of the pin bearings, or bosses, some of the pins being fastened in the bearings of the pistons while others are loose therein, and thus requiring different size pin bosses. Also, some pistons have but a single ring groove while others have two or more, and in some cases oil ring grooves are provided in the skirt of the piston for scavenging the cylinders during the operation of the engine. The number of piston ring grooves thus requires additional thickness of metal at the head of the piston, and itis therefore, an object of my invention to provide a core box which may be readily adjusted to meet all of the above named conditions and variations without the necessity of a different core box for each size and character of piston.

Some of the dimensions of a piston may be approximated but others must be exact, such as for instance, the distance between the pin centers and the head, and it is an object of my invention to provide a micrometer adjustment for determining and establishing this particular dimension.

Pistons of light weight being most desirable for use in internal combustion en- Specication of Letters Patent. Patented July 20, 1920.

Application led October 31, 1918.

Serial No. 261.426.

gines, it is a further object of this invention to provide means in the core box for the shock oi' the explosions,lwith the provision of means for forming annular and longitudinal rib recesses in the piston core. It will be obvious that when the mold is removed from the core, it must be done in such a manner that the composition and formation of the core body will not be disturbed, marred or damaged in any way, and a further object of this invention, therefore, is to provide means for stripping the rib recess molding members from the core body so as to remove the mold from the core without damage thereto.

A further object is to provide removable pin bearing bosses and common means insertible in the walls oi the core box for supporting bosses of different diameter. Other objects will appear as the description progresses. Y

Referring now to the drawings, in which one form of my improved device is clearly illustrated, Figure l is a side elevation of my improved core box, with the several elements assembled for use.

Fig. 2 is an elevation of the same at right angles to Fig. l and partly in section to show the arrangement of the interior of the core box.

Fig. 3 is a fragmentary section of the core box on the line 3 3 of Fig. 5.

Fig. lis a fragmentary exterior view of the same showing the micrometer head adjustment means.

Fig. 5 is a plan of the mechanism shown in Fig. l, partly in section.

Fig. 6 is a bottom plan of the head forming means.

Fig. 7 is a section on line 7 7 of Fig. 5.

Fig. 8 is an elevation of a core made in my core box.

Fig. 9 is an elevation, partly in section of a piston made by the use oi the core shown in Fig. S.

Fig. l0 is a horizontal section of the piston on the line lO-lO oi Fig. 9.

lThroughout the speciiication and in the responding ribs 29 and boss 30 are formed on the piston p.

Member H2 has a vertically extended stem 31V formed integrally therewith which is slidably extendedthrough a boss 32 on member H1 and projects substantially thereabove, as shown, and to the upper end of this stem is attached a cross head 33 by means of a central screw 34, as shown in Fig. 1. Cross head 33 has bosses 35 at the opposite ends which vare spaced to correspond to the spacing of rods 23, on the upper portions of which said bosses are adapted to be slidably held and locked for use by means of set screwsl 36.

n An adjusting screw 37 is loosely extended through cross head 33 and is provided with a knurled head 38 thereabove, the lower end thereof being threaded into the hub or boss 32 of member' H1 and being provided with a lock nut 39 for locking said screw against movement after the same has been set at a desired point.

Cross head 33, during the setting up operation of the core box is loosely supported on the rods 23 and the set screws 36 are tightened only when the mechanism is entirel set for use in the core molding operation.

locking devicev is provided on cross head 33 for screw 37 and comprises a latch 40 held on member 33 by means of a screw 41, a thumb piece 42'being provided thereon at one end and an extension 43 is formed on the other end for engagement with an annuj 33 on rods 23 and screw 37 may be prevented by the latching of the members and 38. lods 23 also are extended through flange 26 of member H1 as shown so that said member may be moved thereon.

A, plurality of radially disposed grooves, or slots, 44', 44'., etc., are formed in member H1' and extend inwardly from the periphery of flange 26 to points slightly inwardly of the periphery ofthe central boss 32, and in these grooves plates 45 and 46 are adjustably positioned for forming rib recesses 45 in the core C. The outer plates 45 are substantially narrower and longer than the plates 46 and screws 47 are threaded in the flange 26, the threads spanning the grooves therein, as shown in Fig. 7, so that the plates 45 and 46 may be held in said grooves by the pressure of said screws thereagainst. These plates 45 and 46m-ay be independently adjusted when the screws 47 are loose, plates 45 forming the wall rib. recesses in the core and the lower ends of plates 46 forming the continuations of the head rib recesses for the formation of the ribs Q9 on the piston, as shown in Fig. 9.

The plates 45 are preferably adjusted so that their lower ends are extended inwardly into the members 1V until said ends rest opposite the shoulder 12 while the lower ends of plates 46 may be extended slightly below Vupper ends of bosses 35 by means of which the assembled core box may be supported in inverted position while the core is being' formed therein. Clamps 50, of any suitable design may be employed for holding the members 11V together for use, as shown in Figs. 1 and 2.

ln operation, the determined length of the piston skirt is established by inserting the extension member E of selected face width between the members 1V and the core print forming member P and attaching the` same thereto by meansV of the screws, or bolts 6.

The suitable size of the pin bearing bosses 20 having been determined, said bosses are attached'to the master boss supports 15 by means of screws 21, and the bosses then inserted in the openings of members `W with the flanges 16 resting against the flat portions 17.

The members P, E and W are then properly positioned in their proper assembled relation and clamp 50 is placed in position for holding said members together, said clamp also serving to hold the pin bosses 15 in members 1V.

The number of rings and the width thereof having been determined andthe consequent amount of ring groove stoel; or metal at the head of the piston calculated, head members H1 and H2 are adjusted by means of adjusting screw 37, member H2 being slidably adjusted within the member H1 and the distance from the lower face of member H2 to the lower end of member H1 being measured as said members are adjusted for accurately setting said members in their' proper relation, screw 37 being turned for such adjustment with head 38 thereof resting upon the upper surface of cross :head 33 while the measurement is being taken. When the required adjustment is completed, screw 37 may be positively set by means ofa lock nut 39 thereon and latch 4() may be turned so that the end 43 thereof will engage the Groove 44 of and lock head 38 of said screw. crew 41 is thentightened so as to prevent the further accidental movement or displace ment of the latch from the head' of the adjusting screw. The assembled head comprising members H1 and H2 is then moved downwardly on guide rods 23 until the flange 26 rests upon the ends of the screws 24, said screws being later adjusted and locked by means of nuts 37 .for limiti-ng the insertion of the member` 25 of member H1 in the mene bers l/V, for providing the ring stock for the piston. j

In order to measure the required distance d between the pin centers and the top of the head, remove clamp 5,0 and also one or the pin bosses 15, insert a rule in the lower end of the core boX and then measure down Jfrom the face of the head forming web of member ,H2 to the center of the pin boss, the measurement on the rule being observed through the opening in member NV from Which theboss 15 wasy removed. Turn the adjusting screws 24 in the proper direction for raising or lowering the head to obtain the exact determined distance desired and then tighten lock nuts 37', reinsert the pin boss 15, replace clamp 5.0 and'tighten set screws 3,6 against rods 23, -thus iirmly holding the body and head forming elements together for use.

The bracing and heat conducting rib forming plates 45 and 46 are next adjusted to their proper positions, the plates alined with the pin bosses being moved downwardly until their lower ends rest upon the bosses 20 and thus provide in ,the core means for forming amaximum reinforcement and braces at these points eXtending from the head to said bosses. Plates 46 at the other points project sufficiently into the core box to provide radial ribs on the inner surface of the piston head and also serve to take up and conduct the heat Jfrom the head. The remaining plates 45 are extended downwardly along the inner periphery of members W for a desired distance for reinforcing the walls of the pist0n and the ribs formed on the piston by the core box thus molded not only reinforce the walls but also serve as heat conductors and prevent undue expansion of the piston walls. lVhile plates 45 and 46 are independently adjustable, they form single mold ing elements and single ribs are cast thereby, andsaid plates are of such a length as to properly accommodate any length of piston. After adjustment, the plates are set and hold by means of `the set screws 47.

The core box, after the completion of the foregoing operations is in readiness for use andfinay be inverted and supported on the flanges 48 of the cross head Jfor filling with sand and the formation of the core therein. Upon the completion of the core, the core box may be restored to initial upright position with the member P as a base therefor. Screw 41 of the latch is loosened and latch 40turned from engagement with the head 38 of screw 37. Member H1 is then raised until further movement is prevented by its engagement with cross head 33, this operation also serving to strip the plates 45 and 46 from the core, thus preventing the marring or breaking of the core as the rib plates are removed, and the said plates sliding updrawn., Screws 36 arenext loosened and members H1 and H2 are bodily removed 'from the guide rods 23, said rods serving as guides forthe head forming members until the same are entirelyifree from the core, thus leaving a clean, smooth surface on the core. Clamp 50 is' then removed and the pin boss membersl are removed from members lV, whereupon said members lV may be withdrawn laterally, one at a time, thus rreeing the core entirely from the core molding elements.

My apparatus may thus be used for Jforming eores for pistonsof di'erent lengths and having different longitudinal dimensions from the pin centers; also by varying the size and number of reinforcing ribs and providing pin bearings of different diameter; all of such varying characteristics being provided for in a single set oi molds. i

rlhe foregoing description and the showing of the drawings pertain to and serve to disclose but a single formvof my improve` ments and it is Yconceived to be possible to modify said disclosure within the scope of the appended claims without departing from the spirit of my invention.

Having thus described my invention, what I claim as new and -desire to secure by Letters Patent, is:

1. In a core box, a fixed body portion having members supported thereon for `forming longitudinal recesses in the periphery of the core, and means supported on said body for extending the end portions thereof relative to said members.

2. In a core box, a separable body, a core print forming member adjustably held on one end thereof, and an adjustable head forming member extensibly Iheld on the other end thereof and recess -iorming means carried 0ny said head forming member, whereby the head and skirt portions of the core may be varied in length. v

3. A core box comprising separable body members one of said members being provided with internal annular reinforcing ribs, whereby corresponding grooves may be formed in the core and a removably held annular rib for forming an annular groove in said core. Y

4. Afcore box having separable body'members held togetherfor forming a core therein, and removably supported internal means `for forming an annular groove in said core.

5. A core box comprising separable body members for inclosing the sides ci a core, a core print forming member extensibly held on one end of said body members, and an adjustable head forming member removably supported on and telescoping the other end thereof.

from the core previous to the removal of said body molding means.

7. A core box for pistons and the like, comprising body molding means closed at one end, said end having a plurality of radially formed slots therein and a plurality of members slidably supported in 'said end and movable intov andfrom the interior of 'said body molding means for forming peripheral recesses longitudinally of the core `and adapted toy be withdrawn from the core previous to the removal of the body molding means therefrom.

-8. A core box Vfor `pistons-and the like,

:comprising body molding means closed at one en d, said end having concentrically and radiating ribs formed on the interior thereof 'for providing corresponding recesses on the end of the core, and means slidably dis- 'posed in said end forforming longitudinal recesses on said core.

l9. A core box comprising a separableV body, a relatively adjustable member slidably supported in Vone end thereof, said member having an annular depending wall adapted to form a corresponding vreduction in thediameter of the core, and means for adjusting the relative positions of said adjustable member and said body.

10. A core box comprisinga'fixed body, a core forming member slidably held Von one `end thereof, screw means for adjusting said member `relative to' said body, and means within and adjustable relative to said member forforming the head of the core.

`l'11.A core box comprising a body, an annular core forming member slidably extended into one end thereof, screw means for adjusting said member relative to said body, and combined head and rib recess forming meansA adjustablyi carried by said memberjfor the purpose set forth.

12. A core 'box comprising abody, a combined head and Vwall forming element removably andslidably supported on one end of said body, meansffor adjusting said element relative to said'body, and means carried by said element for forming longitudi- 'nal recesses in the periphery'of the core,

for the purpose set fort Y 13. A core box for piston cores and the like comprising a body for Vforming peripheral reinforcing rib recesses 'on the interior 0f the piston andat points opposite the ring grooves, and removable means for forming the head and longitudinal rib recesses.

v14. A core box for casting pistons and the like comprising a body having a fixed central portion and extensible head and skirt portions for' varying the dimensions relative to the center, and adjustable rib thereinto, and means for adjusting said head element for making cores of different lengths from a single core box.

17. A core box for pistons comprising a body for forming the exterior of the core,

a head forming element for forming the head thereof, and a core print element extensibly held on said body, whereby cores of different length may be cast from a single core box.

18. A core box for pistons Vcomprising relatively adjustable molding members for forming the head, body and print of the core, and means for adjusting and locking said members in fixed relation for use.

19. A core box for pistons and the like, comprising body molding means provided at the head with a wall of maximum thickness and at the skirt with a wall of'minimum thickness, and means slidably disposed V forming means carried by said head portion.

in said body molding means'for forming the head of the core, whereby additional thickness of metal may be provided in the piston in the casting operation, and means slidably disposed in said body molding means vfor forming rib recesses on the core.

2l. A core box comprising separable body members, separable extension members attachable to said body members, and separable core print molding members attachable to said extension members, whereby the length of a core may be changed as desired,

22. A core box for pistons and the like, comprising separable body molding Vmeinbers, an annular external core molding meniber supported on one end of said body molding members, and relatively movable head molding means, as set forth.

v23. A core box for pistons and the like, comprising separable body molding members for forming the bottom of the core, a removable body molding member supported thereon for forming the top of the core, and relatively movable head molding means supported on said removable body vmolding member. i

,ally separable body molding members and yao 24. A core box forv pistons and the like, comprising halved body molding members, a removable head molding member supported thereon and telescoping into said body mo ding members, and a core print molding member attacliable to the opposite end of said body molding members. e

25. A core box comprising separable body members capable of being held together for moldingthe body of the core, means for varying the length of the body formed thereby, and screw means for varying the dis-` tance from a fixed point on said body to and forming the head of the core.

26. A core box comprising a pair oflaterlongitudinally adjustable end forming members removably carried by said body members.

27. A core box comprising an pair of laterally' separable body molding members, a

core print molding member, extension means for said core print forming member, and relatively adjustable head molding means, as set forth. e

2 8. A core box having separable sides and relatively adjustable ends, whereby cores thereinto and adjustable end molding means carried by said wall molding means, for forming cores of different lengths from a single pattern.

. 3l. A core box comprising a body molding member, a wall molding member slidably supported in said body molding means, and

an end molding means slidably supported in said wall molding means, as set forth.

3,2. yA core box comprising a main body molding member, a wall molding member adj ustably supported thereon, means foi adjusting said wall molding member relative to said body member, an end molding member adjustably supported in said wall molding member, and means for adjusting said end member and locking the same for use.

33. A core box comprising a body molding member, a relatively ladjustable wall molding member telescoping thereinto, an end closing member slidably carried by said wall molding member, means foi` adjusting said members for use, and meansfor permitting an independent movement of said wall and end members relative to said body, for releasing the core. j

34. A core box comprising relatively adjustable` body, wall and end molding mem- 3,6. A core box comprising body, wall and end molding members relatively adjustable for use, and a` plurality o'f rib molding elements supported in said wall and end molding members as set forth. I

37, A core molding device ,for p'istonsand the like including a skirt molt ing element, a relatively stationary head molding element, and a stripping element movablydsposd relative to said skirt and head molding elements,l for freeing the core from the mold.

38. A core moldin device comprising Va skirt moldin" elemeii a relatively stationary head mo dingy eleiiient,v a 'strippii'd element movable relativeto said skirt an" head molding elements, and aplu'ra-lit` of blades carried in said stripping elemen for forming recesses in the core. i v

39. A core molding device comprising a body moldingelement, a relatively stationary head molding element adjustable to different positions relative to said body molding element, and a stripping device movable relative to said bodyand head molding elements.

40. A core molding device `comprisiiigy a body moldingl element, a head molding element on one end thereof, a guide supported on said body molding element and adapted to hold said head element centrally in said body, a movable member on said guide', and means carried on said movablemember and capable of extensiony through said head molding element for forming longitudinal recesses on the core.

41, A core making device including a combined end and peripheral molding member having relatively stationar and movable elements, and means. for imiting the movement of said movable member, as set forth.

42. A core making device havinga stripping mechanism comprising relatively stationary andmovable elements, portions of said movablev element extending through said ,stationary element, whereb the mold may be stripped from the core without damage thereto. Y

43. A core boxliaving a stationary bodyV and a plurality of blades normallyv extended into theinterior of said body and adapted to be retracted therefrom for freeing the mold from a core. l

44. A core mold comprising a body, the

interior of Whichconforms to the interior 01"'. the article to be molded, rib-recess forming elements or blades removably held therein for forming ribs on the interior of said article, whereby said rib-recess forming elements can be Withdrawn Without disturbing the sand core formed in said mold.

45. A core mold comprising a body, the interior of Which conforms to the interior of the article to be molded, rib-recess forming elements or blades adjustably and removably held therein for forming ribs in the interior of said article, whereby said rib-recess forming elements can be Withdrawn Without disturbing the sand core formed in said mold.

Signed at Los Angeles, in the county of Los Angeles and State of California,rthis 23d day of October, 1918.

EDWARD WV. CLARK. lVitnesses LUTHER L. MACK, D. O. FAWCETT. 

